No. 11566. March 6, 1956. Rehearing Denied April 19, 1956. David P. Findling, Associate Gen. Counsel, Frederick U. Reel, Atty., Theophil C. Kammholz, Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Myron S. Waks, Attorneys, N.L.R.B., Washington, D.C., for petitioner. George W. Christensen, Washington, D.C., Thomas J. Downs, William W. Curran, Chicago, Ill., for respondents. Before MAJOR, LINDLEY and SWAIM, Circuit Judges. SWAIM, Circuit Judge. This case is here on the National Labor Relations